Digital signal processing apparatus for detecting a frequency component of digital signals
US5189634A · kind A · utility
8Cited by
6References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 28, 1991 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Mar 28, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H17/0241
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A digital signal processing apparatus is disclosed. The apparatus is particularly suited for detecting a digital signal containing a frequency component in a noisy environment. It uses a distributed arithmetic concept for hardware realization. The use of specific coefficients and hardware arrangement has resulted in a reduction of memory location requirement. The invention finds the main application in the area of telephony in which detection of a variety of signal tones is required for various operations of telephone functions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.